Knife.



No. 690,927. Patented Ian. l4, I902.

J. E. CARLSON.

KNIFE.

(Application filed M312, 1900.

(No Model.)

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ATENT FFICE.

JOHN E. CARLSON, Oh BRISTOL, CONNECTICUT.

KNIFE.

SPECIFICATION forming part of Letters Patent No. 690,927, dated January14, 1902.

Application filed February 12, 1900. Serial No. 4,871. (No modela To allwhom it may concern/.-

Beit known that I, JOHN E. CARLSON, a citizen of the United States, anda resident of Bristol, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inKnives, of which the following is a specification.

My invention relates to the class of knives commonly known asjaok-knives; and the object of my invention is to provide such anarticle with means whereby the blade may be positively locked in an openor closed position and also one in which the means accomplishing thisresult is not easily discovered. One form of device by the use of whichthese objects may be attained is illustrated in the accompanyingdrawings, in which- Figure 1 is a side view of a closed knife enibodyingmyinvention with parts broken away to show construction andwith thelockingbolt in its forward position. Fig. 2 is a like view, but with thelocking-bolt in its rearward position. Fig. 3 is a view in sectionlooking from the front and with the lockingbolt pushed back. Fig. 4 is adetail view showing the blade in side view. Fig. 5 is a side view of theknife with the locking-bolt pushed back and blade open, and Fig. 6 is adetail view of the stationary side part of the handle looking from theinside and showing in dotted outline the position of the blade closed.

In the accompanying drawings, the letter a denotes the stationary sidepart, including a plate a. and a grip 0, secured thereto in the usualmanner. A semicircular slot a is formed in the plate ct at one end. Aback piece 5 is secured to the plate a and has a portion 11, forming anend wall of the case in which the blade is located. An eye I) is formedon this back piece and is adapted to receive the end of a sliding latchthat locks the parts in position. A pivoted side part c is carried bythe side part a, and this pivoted side part includes a plate 0 and agrip 0 secured together, as by means of rivets or screws, preferably thelatter. A semicircular slot 0 is formed in one end of this plate c andis located opposite and registers with the slot a when the blade is inthe closed or open position.

Each of the side parts is provided at the ends with ears, as is commonto devices of this kind, with the exception that the ear (1 .is securedto a sliding latch d, located in a recess in the pivoted side part c.This latch extends along the side part, and its end is adapted to engagethe eye 6 for the purpose described. A recess 61 is formed in the ear dfor the reception of the head of the pivot e, the end of the latchforming one wall of the recess, and a slot through this wall throughwhich the pivot extends forming lips d underlying the head of the pivotto unite the parts at this end of the knife. This construction alsoallows the pivoted side part a slight lateral movement in addition toits pivoted movement and for a purpose to be hereinafter described.

A bladef is mounted on the pivot and has a lug f engaging the slot 66and a lug f engaging the slot 0 in the plates a. and a, respectively.The slots 0 and a are formed on a semicircle, of which'the axis of thepivot for the blade is the center.

The operation in opening the blade is as follows: The lugs f and f arelocated, respectively, at opposite ends of the semicircular slots in theplates a and c, therebylocking the blade against pivotal movement. Theear d being moved outward, the latch dis disengaged from the eye 19 Thisend of the pivoted side part may now be raised sufficiently to clear theeye in its swinging movement. The pivoted side part is swung in thedirection which the blade will have in opening, this movement changingthe position of the lug f to the opposite end of the slot a if the bladeis held stationary until the pivoted side part has reached a position inextension of the stationary part. The engagement of this lugf with theopposite end of the slot a will now swing the blade open as the swingingmovement of the pivoted side part in the same direction is continueduntil the pivoted side part has reached its normal position. The ear dis now pushed inward, causing the latch to engage the eye 6 when the twolugs on the blade are located at opposite ends of the slots in the sideparts as before, thus looking the blade in an open position. Thisposition of the lugs with respect to the slots is shown in dottedoutline in Figs. 1, 2, and 5 of the drawings. To close the knife, thelatch is disengaged from the eye and the pivoted side part swung in thereverse direct-ion from that in opening.

It will be seen from this description that there Will be considerablemystery regarding the operation of opening the knife, for the reasonthat the ears are apparently the same as those in any common form ofjack-knife. If it be discovered that the ear (1 may be moved, there hasnothing apparently been accomplished in this movement, as the blade isas securely looked as before the movement, and it must be furtherdiscovered that the pivoted sidepart has a swinging movement before theblade can be opened.

While I have illustrated and described herein one means by whichmyinvention may be carried into effect, I do not desire to limit myselfto the precise construction shown, as it is obvious that changes may bemade within the range of mechanical skill without departing from theinvention.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a knife, in combination, a stationary side part having an eye, apivot secured to -said part and having a head on its projecting end, ablade mounted on said pivot, a pivoted side part mounted on said pivot,a sliding ear having a lipped recess for the reception of the head onthe pivot, and a sliding latch secured to the ear and arranged to engagethe eye in the stationary side part.

2. In a knife, in combination, a stationary side part having an eye, apivot secured to said part, a blade mounted on said pivot, a pivotedside part having a grip with a recess on its inner surface, screwspassing through said recess and securing the grip to the side part, anda sliding latch having guide-slots engaged by the said screws andarranged to engage the eye on the stationary side part, and means forsliding the latch.

3. In a knife, in combination, a stationary side part having an eye, apivot secured to said part and having a head on its projecting end, apivoted side part having a grip with a recess in its under surface,screws passing through said recess and securing the grip to the sidepart, a sliding latch having guideslots engaged by said screws andarranged to engage the eye in the stationary side part, and an earsecured to the latch and havinga lipped recess for the reception of thehead on the pivot.

JOHN E. CARLSON.

Witnesses:

ARTHUR B. JENKINS, ALEXANDER TATRO.

